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Launer M.,TU Dortmund | Lyko S.,Emschergenossenschaft und Lippeverband | Fahlenkamp H.,TU Dortmund | Jagemann P.,Emschergenossenschaft und Lippeverband | Ehrhard P.,TU Dortmund
Water Science and Technology | Year: 2013

Since November 2009, Germany's first full-scale ozonation plant for tertiary treatment of secondary effluent is in continuous operation. A kinetic model was developed and combined with the commercial computational fluid dynamics (CFD) software ANSYS® CFX® to simulate the removal of micropollutants from secondary effluents. Input data like reaction rate constants and initial concentrations of bulk components of the effluent organic matter (EfOM) were derived from experimental batch tests. Additionally, well-known correlations for the mass transfer were implemented into the simulation model. The CFD model was calibrated and validated by full-scale process data and by analytical measurements for micropollutants. The results show a good consistency of simulated values and measured data. Therewith, the validated CFD model described in this study proved to be suited for the application of secondary effluent ozonation. By implementing site-specific ozone exposition and the given reactor geometry the described CFD model can be easily adopted for similar applications. © IWA Publishing 2013. Source


Lyko S.,Emschergenossenschaft und Lippeverband | Teichgraber B.,Emschergenossenschaft und Lippeverband | Kraft A.,Emschergenossenschaft und Lippeverband
Water Science and Technology | Year: 2012

Sludge bulking is still a problem in the operation of state-of-the-art wastewater treatment plants (WWTPs). The ozonation of returned activated sludge (RAS) is an innovative option as a non-specific measure for the control of filament growth. The applicability of sludge ozonation for bulking control of a large wastewater treatment plant was investigated. At a full-scale WWTP one lane was equipped with a sludge ozonation plant for RAS. The implemented sludge ozonation of RAS was tested against the two identical references lanes of the same WWTP. The positive effect on settleability could be clearly proven. Low-dose sludge ozonation could be a technical alternative in comparison with the established chemical measures for bulking control. © IWA Publishing 2012. Source

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